Lifting and dropping mechanism.



PATENT ED JAIL 24, 1905.

APPLICATION EILED 8121 130, 1904.

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ATTORNEY PATENTED JAN. 24', 1905.

A nfnncaow. I LIP-TING A'ND DROPPING MECHANISM.

APPLIOATION FILED SEPT. 30, 1904. I

2 SHEETS-SHEET 2.

ATTORNEYS verse section thereof.

UNTTED STATES Patented January 24, 1905.

PATENT OFFICE.

ARTHUR D. DUOHOW, OF SONORA, CALIFORNIA.

LIFTING AND DROPPING,MECHANISM.

SPECIFICATION forming part of Letters resent No. 780,874, dated. January 24., 1905. Application filed September 30, 1904. s mi No. 226,670.

To all whom it may concern:

Be it known that I, ARTHUR D. DUcHow, a citizen of the United States, and a resident of Sonora, in the county of Tuolumne and State of California, have invented a new and Improved Lifting and Dropping Mechanism, of which the following is a full, clear, and exact description. r

This invention relates to improvements in lifting and dropping mechanism-such, for instance, as the lifting and dropping of weights for pile-driving, drop-hammers, pumps, welldrills, &c.an object being to provide a machine of this character that will be simple in construction and positive in action.

I will describe a lifting and dropping mechanism embodying my invention and then point out the novel features in the appended claims.-

Reference is to be had to the accompanying drawings, forming a part of this specification,

in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is an elevation, partly in section, of a lifting and dropping mechanism embodying my invention. Fig. 2 is a vertical trans- Fig. 3 is a section through the loose pulley-shaft. Fig. 4 is a perspective view of a section of driving-chain employed. Figs. 5 and 6 are perspective views of chain bars employed, and Fig. 7 is a sectional detail showing a cable-stop device.

In the present drawings I have shown an apparatus as arranged for liftingand dropping a series of hammers or pile-drivers, but, as above stated, other devices may be operated. I have also shown in the drawings two pairs of Winding-drums and winding mechanism, the drums of a pair operating alternately in opposite directions. As the arrangement of each pair is the same, a description of one will answer for both.

Referring to the drawings, 1 designates the main frame, forward of which are guide-posts 2 for the weights. Having hearings in the frame is a shaft 3, on which winding-drums 4e 5 are mounted. As here shown, the winding-drum 5, with its pinion 6, is secured rigidly to the shaft by means of a spline; but the drum 4, with its pinion 7, is connected to a sleeve 8, loosely mounted on the shaft. It may be here stated, however, that both drums, with their pinions, may be connected to the sleeves and the shaft may be stationary. From the drum 4 a cable 9 extends over a pulley 10 at the upper portion of the guide-post 2 and connects with a weight 11, and from the drum 5 a cable 12 extends around a pulley 13 and connects with a weight 1 1.

Having hearings in the lower portion of the frame 1 is a driving-shaft 15, to which is secured a double-toothed pinion 16. A double driving-chain 17 provides connection at one side between the pinion 16 and the gear 6,

while at the other side the chain extends from said pinion 16 to the gear 7, and at each side engaging cross-bars 18 are mounted, leaving a suitable space that will render the chain inoperative on the drum-carrying pulley, permitting said pulley to rotate in a reverse direction to drop the hammer, as will be hereinafter described. It will be noted that the spaces of the-two sides of the chain alternate that is, one is not directly opposite the other and therefore the chain may have continuous motion, thus winding one drum, while the other is released for unwinding. The short cross-bars 18 at the'sides ofthechain are designed to engage with one outer chain and a center chain, thus leaving a space at the opposite side of the center chain. In some instances, however, it maybe desired to make the space at one side shorter than at the other side. In such instance I employ bars 19 having sufficient length to connect with the three chains.

Arranged between thegears 6 and 7 is a grooved guide 20 for the central chain member, while on the opposite side of the gear 6' is a guide 21 for the outer chain member, and

on the other side of the gear 7 is a guide 22' ing-drum. This spring may be pressed into engagement with the winding-drum by means of a screw 26, supported in a bracket 27. To prevent the cable from unwinding after the weight or other device carried thereby shall have reached its lowermost position, I employ a stop connected to each drum, consisting of an arm 28, extending into an opening 29 in the drum and having a spring 30 arranged between its head and a plate at the outer end of the opening 29. On the outer end of the arm is a clip 31 for engaging with the cable.

1n the operation the chain 17 being in constant motion will when itscross-bars engage with one of the drum-gears rotate said drum to wind the cable, and consequently draw the weight upward. At this time the opposite open space of the chain will permit the other drum to rotate freely, permitting the weight to drop. To prevent undue jar in lifting the weights, they may be connected to the cables by springs.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A lifting and dropping mechanism, comprising a pair of winding-drums, a gear-wheel connected to each drum, a driving-shaft, and a chain operated from the driving-shaft and alternately operating said gears.

2. A lifting and dropping mechanism, comprising a pair of winding-drums mounted to rotate independently one of the other, a gearwheel connected to each drum, a drivingshaft, a double gear on said drivingshaft, and a double driving-chain extended from said double gear to the first-named gear-wheels, the said chain having long spaces between its cross-bars at opposite sides, the spaces at one side alternating with the spaces at the other side.

3. A lifting and dropping mechanism, com prising a pair of drums mounted to rotate independently one of the other, a drive-shaft, a double drive-chain operating from the shaft and alternately rotating the drums in a winding direction, guides for the chain on the drum-shaft, and a retarding device.

4:. A lifting and dropping mechanism, comprising a pair of winding-drums, gear-wheels connected to each drum, a drive-chain engaging with said gear-wheels and operating the same alternately, cables extended from the drums, and clamping devices carried by the drums for engaging with the cables.

5. A lifting and dropping mechanism, comprising a pair of winding-drums, gear-wheels connected to the drums, the said drums with the gears operating independently one of the other, a drive-chain comprising a center series of links and outer links, short cross-bars for engaging with center links and outer links, and long cross-bars for engaging with center links and with outer links at both sides.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR D. DUOHOW.

Witnesses:

MARION C. DUCHOW, JOHN C. DUCHOW. 

